CVE-2026-57238 in PDF Editor
Summary
by MITRE • 07/08/2026
After the application opened the PDF, JavaScript deleted the form field object. Subsequently, it attempted to access the invalid object, which caused the application to crash.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic use-after-free condition that occurs during PDF document processing within web applications or PDF viewers. The flaw manifests when a JavaScript execution environment attempts to manipulate form field objects after they have been removed from memory, creating a scenario where subsequent operations on the freed memory location result in application instability and potential crash conditions. This type of vulnerability falls under the broader category of memory safety issues that are commonly classified as CWE-416 Use After Free within the Common Weakness Enumeration framework. The root cause stems from improper object lifecycle management where the PDF processing engine fails to properly validate whether a form field reference remains valid before attempting to access it, creating an exploitable condition that can be leveraged by malicious actors to disrupt application functionality.
The operational impact of this vulnerability extends beyond simple application crashes, as it can potentially serve as a vector for more sophisticated attacks within the context of browser-based PDF processing. When JavaScript code attempts to access freed memory locations, the unpredictable behavior can lead to memory corruption that might be exploited to execute arbitrary code, particularly in environments where PDF viewers are embedded within web browsers. This vulnerability is particularly concerning in enterprise environments where PDF documents are frequently processed and where attackers could leverage such conditions to gain unauthorized access to systems through compromised browser sessions or document processing pipelines. The attack surface becomes significantly broader when considering that many modern applications process untrusted PDF content, making this type of memory safety issue a critical concern for organizations relying on PDF-based workflows.
Mitigation strategies should focus on implementing robust memory management practices within PDF processing engines and ensuring proper object validation before access operations. Organizations should deploy regular updates and patches from software vendors to address known memory safety vulnerabilities in PDF libraries and browser components. Input validation and sanitization measures should be enhanced to prevent malicious JavaScript from being executed within PDF contexts, while also implementing sandboxing mechanisms that isolate PDF processing environments from core system resources. Security controls should include monitoring for abnormal application behavior patterns that might indicate memory corruption events, with additional emphasis on ensuring proper object lifecycle management in all JavaScript execution contexts within PDF processing frameworks. The implementation of address space layout randomization and other exploit mitigation techniques can further reduce the likelihood of successful exploitation attempts targeting these memory safety vulnerabilities.